400105542 has 16 divisors (see below), whose sum is σ = 800557632. Its totient is φ = 133310760.

The previous prime is 400105513. The next prime is 400105579. The reversal of 400105542 is 245501004.

It is a super-2 number, since 2×400105542² = 320168889478227528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013 + ... + 28359.

It is an arithmetic number, because the mean of its divisors is an integer number (50034852).

Almost surely, 2^400105542 is an apocalyptic number.

400105542 is an abundant number, since it is smaller than the sum of its proper divisors (400452090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400105542 is a wasteful number, since it uses less digits than its factorization.

400105542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28883.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 400105542 is about 20002.6383759743. The cubic root of 400105542 is about 736.8710973714.

Adding to 400105542 its reverse (245501004), we get a palindrome (645606546).

The spelling of 400105542 in words is "four hundred million, one hundred five thousand, five hundred forty-two".